Steven Ray Allen

US Patent:

8083364, Dec 27, 2011

Filed:

Dec 29, 2008

Appl. No.:

12/345172

Inventors:

Steven C. Allen - Beverly MA, US

Assignee:

Osram Sylvania Inc. - Danvers MA

International Classification:

F21V 9/16

US Classification:

362 84, 36231102, 36229601

Abstract:

An illuminator is disclosed, in which an LED module emits short-wavelength light toward a phosphor module, which absorbs it and emits wavelength-conditioned light. The emission is generally longitudinal, with a generally Lambertian distribution about the longitudinal direction. The phosphor module includes a transparent layer, closest to the LED module, and a phosphor layer directly adjacent to the transparent layer. Both layers are oriented generally perpendicular to the longitudinal direction. The illuminator includes a reflector, circumferentially surrounding the emission plane in the LED module and extending longitudinally between the emission plane and the transparent layer. Virtually all the light emitted from the LED module either enters the phosphor module directly, or enters after a reflection off the reflector. The transverse side or sides of the transparent layer support total internal reflection, so that virtually all the light that enters the transparent layer, from the LED module, is transmitted to the phosphor layer. In some applications, the phosphor layer is located at the focus of a concave mirror, which can narrow and/or collimate the light emitted by the phosphor.

US Patent:

8283190, Oct 9, 2012

Filed:

Jun 24, 2009

Appl. No.:

12/999651

Inventors:

Steven C. Allen - Beverly MA, US
Richard S. Speer - Concord MA, US

Assignee:

OSRAM SYLVANIA Inc. - Danvers MA

International Classification:

H01L 33/50
H01L 33/64

US Classification:

438 27, 257 98, 257E3306, 257E33075, 257 88

Abstract:

A light emitting diode (LED) lamp includes a base with one or more LED chips, an internal cover over the LED chips, where the cover is a translucent ceramic whose thermal conductivity is greater than glass, where the cover has an interior surface separated from the LED chips by a gap, and where an exterior surface of the cover is coated with a phosphor. The ceramic cover preferably has a bulk thermal conductivity of at least 5 W/(mK), such as polycrystalline alumina. The LED chips preferably are blue LEDs and the phosphor is selected so that the lamp emits white light. In the method of making the lamp, the phosphor may be applied to the exterior surface of the cover as a preformed sheet or in a coating.

US Patent:

8449150, May 28, 2013

Filed:

Feb 3, 2009

Appl. No.:

12/364934

Inventors:

Steven C. Allen - Beverly MA, US
Hong Luo - Danvers MA, US
Angela Hohl-AbiChedid - Beverly MA, US

Assignee:

OSRAM SYLVANIA Inc. - Danvers MA

International Classification:

F21V 5/04
F21V 3/02

US Classification:

36231106, 36231102, 362308, 362327, 362335, 362520, 313512

Abstract:

An optical element is disclosed. The optical element includes a single, transparent, rotationally-symmetric lens with a batwing shaped cross-section, extending angularly away from a longitudinal axis. The lens also includes a variety of curved, straight, specular and optionally diffuse portions on its longitudinal and transverse faces, all of which cause a variety of internal and external reflections, refractions, and optionally scattering.

US Patent:

8556473, Oct 15, 2013

Filed:

Aug 5, 2010

Appl. No.:

12/851001

Inventors:

Ming Li - Acton MA, US
Steven C. Allen - Beverly MA, US
Sarah Bazydola - Belmont MA, US

Assignee:

OSRAM SYLVANIA Inc. - Danvers MA

International Classification:

F21V 7/00

US Classification:

362350, 36224902

Abstract:

A lamp assembly, and method for making same. The lamp assembly includes first and second truncated reflector cups. The lamp assembly also includes at least one base plate disposed between the first and second truncated reflector cups, and a light engine disposed on a top surface of the at least one base plate. The light engine is configured to emit light to be reflected by one of the first and second truncated reflector cups.

US Patent:

20100263723, Oct 21, 2010

Filed:

Jul 21, 2008

Appl. No.:

12/669579

Inventors:

Steven C. Allen - Beverly MA, US
Andrew J. Steckl - Cincinnati OH, US

Assignee:

UNIVERSITY OF CINCINNATI - Cincinnati OH

International Classification:

H01L 31/0232
H01L 33/50
H01L 33/44
H01J 1/62
C09K 11/08
C09K 11/56
C09K 11/67
C09K 11/54

US Classification:

136259, 257 98, 313483, 2523014 R, 2523014 S, 2523014 F, 2523016 R, 257E33061, 257E33067, 257E33059, 977773

Abstract:

A light emitting composite material () comprising a glassy material () and a phosphor () suspended in the glassy material (), wherein the refractive index of the phosphor () is approximately equal to the refractive index of the glass material. The light emitting composite material () can be used in phosphor-containing light emitting devices, solid-state laser () diodes, and as a luminescence collector ().

US Patent:

20130026922, Jan 31, 2013

Filed:

Jul 29, 2011

Appl. No.:

13/194537

Inventors:

Steven C. Allen - Beverly MA, US
Camil Ghiu - Danvers MA, US

Assignee:

OSRAM SYLVANIA INC. - Danvers MA

International Classification:

H01J 7/24
H01L 33/60

US Classification:

315113, 257 98, 257E33072

Abstract:

An apparatus and method of a lamp including an optically transmitting, thermally conductive substrate is provided. The substrate has a first side, a second side, and at least one edge. At least one solid state light source, such as but not limited to a light emitting diode, is disposed on the first side of the substrate. The at least one solid state light source (e.g., light emitting diode) includes at least one junction having a first junction temperature. The substrate used is an optically transmitting, thermally conductive substrate, with a thermal conductivity greater than or equal to about 3 W/mK.

US Patent:

20130088142, Apr 11, 2013

Filed:

Oct 5, 2012

Appl. No.:

13/645790

Inventors:

Osram Sylvania Inc. - Danvers MA, US
Steven C. Allen - Mason OH, US

Assignee:

OSRAM SYLVANIA INC. - Danvers MA

International Classification:

H05B 33/02

US Classification:

313498

Abstract:

Arrangements of solid state light sources for color-mixing, and light sources including the same, are provided. A substrate has and a plurality of different color LED chips coupled thereto. The emitted light is mixed to produce a white light output. The LED chips are arranged on the substrate in a manner that improves color-mixing, for example, by forming LED sets including one or more LED chips of different colors, by skewing the LED chips, and/or by forming a non-rectangular array or a circular array of LED sets and/or chips. The color-mixing LED arrangement may be used in a lamp or other light source together with collimating optics to collimate and further mix the color-mixed light output from the LED arrangement. The color-mixing LED arrangement may be provided as a single package with multiple LED chips or as multiple packages of one or more LED chips.

US Patent:

20130307422, Nov 21, 2013

Filed:

May 15, 2012

Appl. No.:

13/471650

Inventors:

Fred Palmer - Danvers MA, US
Kerry Denvir - Cambridge MA, US
Steven Allen - Mason OH, US

Assignee:

OSRAM SYLVANIA INC. - Danvers MA

International Classification:

H05B 37/02

US Classification:

315186

Abstract:

A driver circuit for a light source including one or more solid state light sources, a luminaire including the same, and a method of so driving the solid state light sources are provided. The driver circuit includes a rectifier circuit that receives an alternating current (AC) input voltage and provides a rectified AC voltage. The driver circuit also includes a switching converter circuit coupled to the light source. The switching converter circuit provides a direct current (DC) output to the light source in response to the rectified AC voltage. The driver circuit also includes a mixing circuit, coupled to the light source, to switch current through at least one solid state light source of the light source in response to each of a plurality of consecutive half-waves of the rectified AC voltage.